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Reference signal pattern

A reference signal and reference symbol technology, which is applied in the field of reference signal modes to reduce decoding delay and increase resource utilization.

Active Publication Date: 2018-08-31
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not sending a reference signal at the start of a subframe also delays the time the receiver can make channel estimation, and thus delays decoding

Method used

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Embodiment Construction

[0034] As described above, since the UE is not aware of PDCCH transmissions to other UEs, the UE does not know which subcarriers in the first OFDM symbol of the subframe are modulated. Mapping PDCH to the first OFDM symbol is not straightforward. This is because the PDCH has to be mapped around other users' PDCCHs which the UE is not aware of. The same problem applies to reference signals. Existing methods of mapping PDCH and reference signals starting from the second OFDM symbol have certain drawbacks. For example, not sending a reference signal at the beginning of a subframe delays the time at which the receiver can perform channel estimation, and thus delays decoding.

[0035] The present disclosure contemplates various embodiments that can address these and other deficiencies associated with existing approaches. In some embodiments, this is achieved using a reserved resource element pattern defined in OFDM symbols carrying control information. In some cases, the first ...

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Abstract

A method in a node (110, 115) comprises generating (704) a frame structure comprising at least a first subframe (305, 405, 505), the first subframe comprising a first symbol (310A, 510A) and a secondsymbol (310B, 510B), each of the first and second symbols comprising a plurality of resource elements. The method comprises reserving (708) one or more of the plurality of resource elements in the first symbol for reference signals (335A-G, 435A-G, 535A-G), modulating (712) one or more of the reserved resource elements in the first symbol with reference symbols (335B-D, 435B-D, 535B-D), the modulated one or more of the reserved resource elements in the first symbol comprising a subset of the one or more reserved resource elements that overlap in frequency domain the data transmission carried in the second symbol, and transmitting (716) the at least one subframe to another node.

Description

technical field [0001] The present disclosure relates generally to wireless communications and, more specifically, to reference signal patterns. Background technique [0002] Release 14 will mark the start of work on 5G within the Third Generation Partnership Project (3GPP). 5G will include Long Term Evolution (LTE) evolution as well as New Radio Access Technology (hereinafter referred to as "NR"). [0003] figure 1 An example proposed frame structure for NR is shown. more specifically, figure 1 Two downlink (DL) subframes 5A and 5B (of the proposed frame structure and DL control channel structure) are shown. Each of the subframes 5A and 5B includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols 10 . The subframe 5A comprises a first OFDM symbol 10A, a second OFDM symbol 10B, a third OFDM symbol 10C, and a fourth OFDM symbol 10D. Likewise, subframe 5B includes a first OFDM symbol 1OE, a second OFDM symbol 1OF, a third OFDM symbol 1OG, and a fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0048H04L5/0007H04L5/0044H04L5/0051H04L5/0053H04L5/0023
Inventor R·巴尔德梅尔E·达尔曼S·帕克瓦尔H·比约克格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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